Sir, I'm right trumpets Mr Gray (Gray Matter, June 2). Well, of course he is.

However the issue is whether everyone else is, therefore, wrong. Let's (or let us) go back to the original point.

Mr Gray aggressively defends Alas the path continues only as far as the Thames beyond it's potholes and puddles.

I suggested that his anonymous correspondent rather than being an ignoramus might have been proposing the older style Alas the path continues only as far as the Thames beyond it is potholes and puddles.

For the record, my preferred punctuation is Alas the path continues only as far as the Thames. Beyond it's potholes and puddles.

It's could, however, have been written as Alas the path continues only as far as the Thames. After this potholes and puddles predominate.

All four are technically correct. Which of the above do readers find hardest to grasp at a first glance?

Rhys Hedges, Oxford